Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Packet header designating cryptographically protected data
Reexamination Certificate
2005-04-05
2010-10-05
Cervetti, David Garcia (Department: 2436)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Packet header designating cryptographically protected data
C725S025000, C380S201000, C380S210000, C380S255000, C380S277000
Reexamination Certificate
active
07809942
ABSTRACT:
A conditional access method and apparatus for use with a system for controlling of digital TV program start time. Subscriber access is authorized to digital program streams. Content are divided into a plurality of working periods. Each working period of the plurality of working periods is scrambled with a different working key. A working key of a given period is delivered ahead of the given period. The working key is synchronized with scrambling control bits in an header. working keys are inserted into an entitlement control message (ECM) packet, and the ECM packet is encrypted using a service key. A time period is inserted into the ECM packet during which the service key is valid. A service key is inserted in an entitlement.
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Baran Paul
Field Michael
Lin Xu Duan
Pickens John
Beffel, Jr. Ernest J.
Cervetti David Garcia
GoBack TV, Inc.
Haynes Beffel & Wolfeld LLP
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